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T450s Won't Boot After Battery Depletion

Q: T450s Won't Boot After Battery Depletion

Hi, I have a user at my company the let's her T450's battery rundown to empy... (She leaves it in sleep mode over the weekend and the battery dies) This happend a while back and I had to leave the laptop on charge all day, unplug the battery, hit the reset button on the back and then plug everything back in for it to start up again. Today, this issue happend again where the user ran the battery down to 0% and now the laptop will not boot up at all. I tried the following things noted below but all the laptop does is display three quick power button flashes when I plug the power cable into it. *Uplug the power cable and the battery. Hit the reset button on the back and then tried to power it on - Nothing*Uplug the power cable and the battery. Hold the power button down for 30 seconds and then tried to pwer it on - Nothing Going to leave it sit for a while but I do not think this is normal when someone runs the batter down to 0%. Has this happened to anyone else or is this laptop dead and I will need to send it in for service? Would like some thoughts on this... Thanks!

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A: T450s Won't Boot After Battery Depletion

It sometimes takes an hour or so before the battery appears to begin charging from total empty, but usually it should boot fine regardless.Do these have the internal battery as well as an external battery?

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Hello everyone! I use the t450s for school, and I'm very happy with it thus far. My only complaint is battery. Just today, I realized it had a 2nd battery. I'm relatively unfamiliar with it, so could someone please tell me how it works? Does it kick in after the 1st battery dies? Do I have to enable something? Thanks guys!

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Hi!Just switched from a macbook air to a T450S. Really like the computer in general but the battery time sucks for me. I use quite heavy applications but I still only get about one hour battery time (even though I have tweaked the battery optimization settings in the Power Manager. According to the specifications when I bought the computer, the batteries are of the type 6-cell litium jon 47wh.Is there anything I can do to make the battery life better? 

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T450s running Win7 Pro - all Windows and Lenovo Updates The Power Manger indicates no battery install Device Manager shows both the internal and ecxternal battery installed Power Manager does detect when I unplug the AC adapter Any idea why Power Manager is not seeing the batteries ? Steve

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Hi all, My 2-year old Lenovo T450s is experiencing charging problems. If I plug in the battery charger, it starts charging for a second, it then stops, then the cycle starts again. Needless to say that none of the batteries (neither the built-in nor the external) charge properly. I tried to: (1) buy a new battery charger, (2) unplug the external battery leaving the internal plugged in, (3) unplug the built-in (internal) battery leaving the external plugged in. None of these solutions worked. I then unplugged both batteries and plugged the battery charger, and the laptop works. What do you think? Is it a hardware problem (perhaps related to the motherboard - I can't think of anything else)? Is it a software problem? Thank you in advance for your time! Best, Paolo

A:T450s only works on AC when battery is removed

I cannot be sure without seeing it, but I would guess motherboard charging circuitry.  I am assuming it will not charge while turned off.
Are you still under warranty?  Many are 3 years

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HiAnyone using Thinkpad T450s, everything is good excepet for the battery life. I bought late in 2015, I usually have a 3-4 hours unpludged, which only do some document editing, web browsing and some stuff like that, It is supposed to be 8 hours, is that right?What the hell should I do?!!

A:T450s battery life lacking

Hello and welcome,
I can't answer directly but it will depend on the combination of internal and external batteries you're running.  There were several options.
Which do you have?

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Hi, I like that my T450s has 2 batteries. But the thing that bothers me is that the removable battery is drained first entirely prior to using the built-in battery. I've noticed that this increases the "cycle count" of the removable battery as essentially the battery has been completely used. In other laptops this is not a problem as they come with 1 battery and the cells are depleted uniformly.  This has only become a concern for me when I want to use the laptop for long hours without a charger. This would increase the cycle count of the removable battery if done on a daily basis. By doing so will I be ruining the battery life ?  Pls let me know, thanks.

A:T450s - How many cycles can the removable battery ...

Not sure, but I guess this is a bit by design, True the external is wearing more by having more cycles, but this also means that the internal one has a increased live time. The external one will be the first to wear, but is also the more easy one to replace .I already have 2 externals with my laptop.But I get your point and I'm curious about it too. Depleting a battery fully will wear a Li-ion more then not fully depleting it (if my study's where right that is). So it might be true that the less wear on the internal battery does not compare equally to the extra wear caused to the external battery.On the other hand, the extra wear might not be that great to worry about. And this dubble battery design does give us the awesome feature to hot-swap external battery's (which I use quite more that I thought I would).

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Hi!I just received my brand new T450S with Win 7 Professional and Battery 1 is not charging (initially it was at 80% but now it's down to 79%).After reading here on the forums, I tried to see if I could find some info in the Lenovo Power Manager but without no luck (in the settings it says that the battery should fully charge).Any suggestions on what to do?THanks,

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My T450s has recently started discharging the internal battery first rather than the removable battery. I can't recall when this started to happen but I think it happened when I updated the BIOS to the latest version currently available. Anyone have any insight if this is an issue with other models and a fix? This is rather annoying. I have updated all of the other drivers with the System Update utility from Lenovo. Machine Type: 20BW

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Hi, I have an issue with my T450s laptop battery. The power management tells that the battery is charging and not charging intermittently. I am running windows 10 PRO 64 bits.I have the latest drivers and bios. 

A:T450s Laptop Battery issues

Does it not charge if you plug in the AC when the battery is above 96% already?

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Hi everyone, Just received my T450s. Installed the rear battery, then plugged in the power.  On my old T510 I have an indicator showing me when I have power hooked up, and indicates the charging status of my battery.  I don't see anywhere on the T450s chassis that indicates the status of the battery charge. The only thing I will see is the dot on the "i" on the top cover, flash when I connect power.  Surpised there isn't a status indicator. Peter

A:Just got my T450s - no battery charging indicator?

No, there is no charging indicator on the T450s. By popular demand, Lenovo added one back to the T460s.

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Are T440s and T450s external 6 cell 72WH battery compatible?

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I got a T450s, brand new and everytime I am not plugged in (it's a laptop after all) the computer litteraly slows down to a point where it is unusable, a simple key (space, a letter, a number) will usually take 3-5 second and sometimes up to 20 seconds to register, no software is usable, CAD, video playback and authoring, completely useless when on battery. The thing is this is a laptop, I WILL use it on battery. That is despite me choosing high performance in the Lenovo power manager.
Anyway I can fix this?
Moderator comment: Model added to subject for clarity.

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Got a new t450s laptop and at my first use, the battery is at 49% after and 1 hr and 30 minutes of extremely light use (browsing, and most of the time away from laptop) with mid brightness and on better battery mode. The battery claims to only have 49 minutes left. I need this laptop for school and I will be returning it if the battery life is this poor. Is this a regular occuring thing? I have never even used this laptop before and I am extremely dissapointed at the rate at which it's draining. 

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Lenovo T450sWindows 10 v1709Internal battery removedRemovable battery not installed when connected to ac power Has anyone noticed...When FnLk is toggled on, the green LED on the Fn key is not lit unless a battery is installed even though ac power is connected.This was never the case with Win10 v1703.

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I'm dual booting Windows 10 and Ubuntu 18.04 on my T450s. About a year ago, when I first replaced the removable battery with a new extended 6-cell external battery, I was getting 12-14 hours of battery life off a single charge. Now I'm getting about 5-6 hours on both OSs. I checked the battery health on LInux via: $ upower -i /org/freedesktop/UPower/devices/battery_BAT1and got the info that the external battery had only lost a few percent of its original capacity (can't give exact figures cos writing this from Windows). My general use cases are running firefox, mail clients (geary/postbox), translation/word processing software (memoy ms word, libreoffice). Main CPU usage usually seems to be Windows background processes. What can I do to resolve this? Recalibrate the batteries (although I'm struggling to find tools to do that on the t450s)? Reinstall Windows and Ubuntu?

A:Battery life on T450s with 6-cell reduced by 50% in a year

   I'm not sure how helpful this is but... it's all I've got...if you boot to Windows 10 and run the Vantage tool you can do a draw-down test.This wil reset the battery gauge, and having done that it testyou can then compare the present "Full Charge" capacity vs. the design capacity.

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how can I perform a system check on a built-in (not the external one!!) battery on T450s model? is there a way to get a replacement if I have an excessiv performance loss? The battery is in use for a bit more than one year and I have a 3 year warranty on it.Regardsmarco991

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I have read quite a few threads regarding Lenovo laptops requiring the battery to be disconnect to get the unit to turn on once it goes to sleep or is manually shut off.  I started having this issue on my 3 year old t450s about 3 months ago.  I disconnected the internal battery so that starting it up only involves removing the external battery. Is there a solution to this issue?  Of course I'd like to resolve it on this laptop but I'm even more concerned about purchasing an new t model laptop.  Love the laptop but am frustrated by this issue. Mark

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After a long journey, both batteries in my T450s were flat, and this morning when I plugged in and booted up I got the message that "The battery installed is not supported by this system and will not charge".  True to its word, one of the batteries does not seem to be charging.  These are the original batteries which came with the laptop when bought new from Lenovo.  They have performed well since I received it, no problems to date, and no obvious reduction in performance.  How can I get the battery charging again? Thanks for your help.

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I have a Lenovo Thinkpad T450S laptop has two batteries. Internal Battery 1 is working perfectly fine. HW Info shows the following Info:Power Status: On AC PowerCurrent Capacity: 19570 mWh (100.0 %)Current Voltage: 11.936 V Removable external battery has been on 0% and charging for a weeksUnique ID: SANYO45N1775Designed Capacity: 23200 mWhFull Charged Capacity: 16570 mWhWear Level: 28.6 %Power Status: Charging Critical On AC PowerCurrent Capacity: 0 mWh (0.0 %)Current Voltage: 5.123 V I started hearing the USB Connect/Discount Sound when I recover laptop from Stand By mode approximately the same time that the battery stopped charging. I have no external devices (hard drive, printer, mouse, USB...) connected. I some times get the message "Battery 2 Not installed Message in a white pop up window. I have tried the following but the problem still persist1) Fresh Installed Windows 10.0.17134 Build 171342) Updated to the latest Bios Firmware3) Updated Lenovo Energy Management software but got a message saying Windows has the latest Drivers (However Battery Driver says Microsoft 2006)4) Updated Battery Firmware but got a message saying nothing to update5) Installed Lenovo Vintage Software & Reseted the battery but got an Error. Could it be a Windows Update problem since I am hearing Device (USB) connect/disconnect sound & the battery issue happen approximately the same time?Any suggestions? Buying a new battery would be my last option

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This just happened to me again this morning. The third time in 3 months. I open my laptop and the three lights on the keboard (FN/Mute/Microphone) are all on. The power button does nothing at all. Suggested solutions that I've tried:- Insert a paperclip into the small hole on the bottom of the laptop and press the button with it.- Press the power button 11 times, then hold for 30 seconds on the 12th time. The only solution that has worked for me is to open up the laptop and disconnect/reconnect the internal battery. I now cannot trust that my ThinkPad will turn on when I need it. This could be bad for business if it happens at an inopportune time. I need a solution. Any ideas?

A:T450s won't wake. Power button does nothing. Only solution is to disconnect internal battery.

I am not confident of these suggestions, but would suggest that you try the following:: confirm you have the latest available BIOS, drivers, and operating system,Reset BIOS to the factory defaults and then make any needed adjustments to the BIOS settings.

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Good day Lenovo users: I recently purchased a Thinkpad t450s form Canada Computers in Toronto Canada as refurbished, it has touch screen which i like, but ever since i got this laptop i noticed this model has no fingerprint, battery dies in like less than 45 mins, and when ever i connect Audio jack for headphones and i tried many different connectors and headphones, the audio continues to play through the speakers... it did work first few days, but all of a sudden it stopped. i did bios update, driver uninstall and re-install, driver update says its up to date, windows is up to date....If anyone can help me with these to better understand what actions to take, that would be greately appreciated!!! Thanks for your times!

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Startup Tab: Set Network Boot to USB HDD but won't boot from USB Bios [ ver JBET62WW (1.26) 9/7/16]No option to change from UEFI only. Boot Mode option is set to Quick (only other option is Diagnostics)What am I missing? Background: the Win 10 1607 upgrade did not install properly. I can boot to desktop but there are issues. Can't roll back so have ISO on USB.

A:T450s Can't Boot From USB

under security, turn off secure boot.  Then change boot tab to "both"

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The computer power button turns green when I turn it on and it displays the ThinkPad logo and the words 'To interrupt normal start up, press enter'. The screen then goes black. I am able to enter Bios on bootup so it is not a display issue. I was using my computer yesterday morning, then it died, and now this is happening.  When I plug a power cord in, the green power button flashes 3 times. I have tried:- holding down the power button for 30 seconds- hooking my laptop up to another display - using a paperclip to reset the battery

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Helloi am trying to install a new image on my T450S with latest bios.PXE boot from my WDS-server isn`t working to this laptop (all others brands like HP etc. are working) With default WDS-settings (so no option 66 or 67) i get PXE 53 No boot file name received.Tried many options with changing these settings in WDS and also in the bios of the T450S without results. Which settings are needed to pxe boot the T450S to WDS/MDT?Thx

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UPDATE: Finally finally managed to change boot order... still refuses to boot from new M.2 unless I use the F12 boot menu.I even excluded the old  one from the boot menu... now it just launches into repair mode. Why will it boot from the new M.2 (which is now the C drive) just fine with the F12, but not just by turning it on?I've installed a new 256 M.2. The system insists on booting off the old 16BG drive (which had Win10 pre-installed), even though I've made the new one the C drive. The old one is now E, and unless I used the F12 boot menu, it always boots from the 16 GB M.2.I migrated Win10, and it will boot fine... if I use the boot menu. BUT... I've changed the 16 GB drive to E:, and the new one to C. Why, why, why does it keep insisting on booting from the now E: drive? I even deleted files off it, now it just gets errors and I have to use the F12 boot menu every time to boot from the C: drive.I've searched for hours... and hours... for a way to change the boot order. But Lenovo seems to have (malevelontly, because they hate me) removed that menu from the BIOS. How the heck do I change this? Please?

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Hello, My T540s (which just ran out of warranty ...) has a very weird issue : When I try to boot (clicking the power button), the fan starts turning, the keyboard's backlight turns on, but ... a second later (even before the Thinkpad logo shows up), the whole computer crashes and shuts down !Where it gets even more special is that from time to time (1 out of 1000) the computer boots normally, although giving me this warning :Secure Flash Authentification FailedCapsule Data is invalid_ I'm kind of lost right now, really don't know how to get that fixed. My friends think that my motherboard needs to be changed, but I really want to be sure before buying a new one (very expensive). I suspect a bug in the BIOS (recent update failed ?) ... What do you think ? Does anyone have or had the same problem ? Thanks for helping, Best, Sylvain E.K.  PS: Running Win7 64bit

A:T450s random crashes on boot

One possibility: damaged USB port.  This was known to happen on some older T-series laptops.  Bent USB port pins would short power, causing the quick shutdown.
It's not likely in your case (would be 1000 failures out of 1000...) but worth a quick check.

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Hi,I noticed recently that after booting up my T450s with Windows 10 64-bit, the process "SynapticsWinbio Synchronization Service (CMN)" will consume ~30% of CPU utilisation. I checked that this is the Windows service "BiometricSensorDataSynchronization" which runs executable "valWbioSyncSvc.exe", and is part of the Validity Fingerprint Common Driver 4.5.507. I downloaded the latest driver from Lenovo (which is also 4.5.507) and reinstalled it, but the problem persisted. I did found that restarting the process (via Services MMC) after killing it will stop the high CPU utilisation. But this is just a workaround, since this needs to be done after every boot up. Has anyone faced this problem and know the solution?Would appreciate any advice.

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Hello. My new T450S (bougth in december 2015), running W7 with all drivers regulary updated, often refuses to boot when docked (ThinkPad Ultra Dock) : the systems hungs on the first Lenovo screen and "press enter key" procedure is not working. Most times a second boot will work, but sometimes I have to undock in order to get de PC started. Stand alone booting never gives problems.I neither have wake-up or other dock or undock problems. Thank you for help. Hans   

A:boot problem with my T450S when docked on Ultra Do...

I have exactly the same issue and so far unable to find a solution. 

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My year-and-a-half old T450s stopped booting up. Yesterday I was prompted for a Windows update and restarted the machine, as usual. After the update, I'm able to turn it on but it wont boot up. It shows the initial screen, with the "Lenovo" logo and won't proceed beyond.I tried taking out one battery and then holding the on/off button for 30 seconds, and also the emergency reset on the bottom, but neither changed anything. It simply won't go beyond the initial screen. Does anyone have any thoughts? Thanks in advance.   

A:ThinkPad T450s won't boot up after a Windows updat...

I think you are experiencing the same issue I have. If you notice after the Lenovo boot logo the display still stays on its just black, what it appears to be for me is a video failure after trying to update to windows 10 anniversary update. Try plugging in an external monitor and see if you get display, I did in my case.  Remove your hard drive and restart the PC, this should get the bios working again, go into your bios and disable secure boot so you can boot to a USB. Create a bootable USB 3.0 using a USB3.0 drive (formatted to NTFS) from Microsoft's site - https://www.microsoft.com/en-us/software-download/windows10/ Then goto repair my computer and choose rollback update, this will get you running again.  I have a p50 with Nvidia M1000M dedicated graphics, so I am still trying to figure out if this is a driver issue.

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My battery was dying. I tried calibration, letting the lenovo run just on the battery. It looks like it went down to 0%, then shut off. But it wouldn't charge. It was probably never charging in the first place, always running off the power of the AC.  But I could still boot to AC. So I bought a new battery. It said to calibrate. So I tried that. The battery ran down to maybe 20%, then shut off. But the same result. Laptop will neither boot nor charge the batttery. Again, it will boot just fine with the battery out.  So, what's to be done? Also, I tried to get into the BIOS via F2 and F12, but that doesn't work either.  - Dan  

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I've installed a 256 M.2.Migrated Win10 to it. It will boot fine... if I use the boot menu. BUT... Even though I've changed the drive letter, it insists on using the old 16 GB cache drive (which for some reason was the C drive and had WIn10 on it when I got it).I've changed the 16 GB drive to E:, and the new one to C. Why, why, why does it keep insisting on booting from the now E: drive? I even deleted files off it, now it just gets errors and I have to use the F12 boot menu every time to boot from the C: drive.I've searched for hours... and hours... for a way to change the boot order, but Lenovo seems to have (maliciously) removed that menu from the BIOS. How the heck do I change this? Please?

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I'm just wondering how to remove these extra options which aren't even on this hard drive and were actually on another hard drive that I had installed. Basically I've been playing around with operating systems on my T450s and now there are a ton of options lol. Basically I'm not running any of these options anymore at all, I thought maybe they were coming from the MBR or something but I wiped that out and then even put in a different hard drive. The only OS I have installed right now is Kubuntu.

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I have a T450S that is a few months old. It has worked fine until just the other day when it would not turn on. When I push the power button, the green LED flashes three times. Then, the LEDs on the F1, F4, and Fn keys come on for several seconds and go off. Here's what I've tried:- Charging for an extended period.- Removing the battery for an extended period.- Removing the battery and holding the power button for 60 seconds.- Pressing the button in the emergency reset hole. Nothing has made any difference. Any ideas?


Go to Solution.

A:T450S won't boot, power button flashes 3 times

Update: I called Lenovo support and am sending it in for repair.

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My hp laptop had its battery flat for 12 hours. After that the laptop can nolonger boot up or charge. Please help

A:HP laptop cannot boot up or charge battery after battery went flat for 12 hours

What is the model of your laptop?

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All, Very strange thing going on, and I've not seen it on these forums, so here I go. Turn on laptop, the HP screen appears, and about 20 minutes later, Windows starts loading.Turn off laptop, pull the battery, turn on the laptop, and Windows starts loading within 10 seconds (normal). When the battery is in, EVERYTHING takes 15-20 minutes to start.  If I select F2 for settings, it takes that long.  If I hit F10 (or possibly F8), same delay.      If I take the battery out, it works perfectly. So....I of course assume bad battery......but I've never seen this type of behavoir in ANY computer previously. Any suggestions?HP G62-340US Notebook Windows 7 Home PremiumNo error message and no changes made to system. Thanks Donlen

A:HP G62 Battery causes slow boot - take battery out and boots...

BTW - I've noticed other things like "Failed DST" and things like that...but only when the battery is installed. When battery is out....passes all diags.

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I turned on a Philips 15nb57 series Model No EAA-89, but my battery died on start up and I didn't have time to put the power cable in.

I then switched on laptop again and the following error came up,‘Windows Error Recovery, windows fail to start , recent hardware or software installation may be problem'


'Do you want to start windows normally or go to recovery?

Recovery mode
Start repair environment (doesn’t do much)
Reinstall windows
Adv options
Exit and restart'
Do you think I have corrupted the Bios and need to get a external floppy drive (or flash drive) to reinstall it?

This is a friends computer who had support from the 'tech support' recently,they took control of her 6 yr old laptop to install a small program to fix a wireless printing problem. hopefully not related.



A:Windows won't boot up, battery died whilst booting up now won't boot up

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I can't believe this is an unsolvable issue...
my Studio XPS1340 isn't that old...
and my battery was replaced by warranty a little over a year ago...
it was charging fine...then suddenly, when I rebooted, I got:

WARNING: The battery cannot be identified.This system will be unable to charge this battery.Press Any Key to ContinuePress <F2> 2 times to enter SETUPPress <F12> and Any Key to enter Boot Menu
Do I just need to replace the battery?

A:WARNING: The battery cannot be identified. This system will be unable to charge this battery. Press Any Key to Continue Press <F2> 2 times to enter SETUP Press <F12> and Any Key to enter Boot Menu

I apologize for the inconvenience caused to you. You can follow the steps below:
Drain the residual power of your computer and recaliberate the battery by following the steps below:

Power off your computer. 
Remove all the external peripherals  (printers, scanners or any other USB device) connected to your computer.
Please remove the AC adapter and battery of your computer. 
Press and hold the power button of your computer for 10-15 seconds to drain the residual power. 
Release the power button
Keep the battery out for atleast 2 - 3 hours.
Then insert the battery and charge it overnight with the system powered off.
Insert the battery in and connect the AC adaptor.
Then power on the computer and see if it works.

If the issue still persists, you can update the BIOS of the computer.
Note: Make sure the ac adapter is connected and the battery is charged 10% or above to update the BIOS. Also, disconnect all the external peripherals before updating the BIOS. All the programs should be closed and documents saved.

Click on the below link: http://dell.to/Th8z4k
Click on “Download File”.
Select “For Single File Download via Browser”.
Click on “Download Now”.
Save the BIOS on your desktop.
Once the BIOS is downloaded on the desktop, right click on it and select “Run as administrator”.
Follow the prompts on screen and restart your computer.

 Please reply with the findings.

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I have an older HP Omnibook 6000 upgraded to 512 of memory running XP with service pack 3, using an airlink card for wireless and Trend for security.

I tried to clean up some disk space and must have deleted something the OS needs. Here is what happens:.

(1) Plugged in, everything is perfect.

(2) When I unplug and try to go to battery, the screen/mouse/keyboard interface freezes. My airlink card stays green (active) and I can still hear some whirring sounds. The hard drive access light goes off.

(3) On battery, the system boots and runs fine in SAFE mode.

(4) When I try a normal boot unplugged, here is how far I get:
<F2> ... screen comes up -- Windows XP logo and blue "activity bar" come up, hard drive access light is working, airlink card green light comes on -- Black screen, which is usual just before the login window, but instead of login window the machine acts as in (2) above.

A:Won't Boot on Battery

Go into safe mode and go into msconfig and open the start up tab. What do you have in there? I would bet a lot of apps initializing on boot up. Keep only the apps you need like antivirus, firewall if there is one and any app you feel you need, but you only really need the above mentioned.

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Notebook doesn't comes further then the screen where i can press "Esc" for the boot menu, seconds later I get a battery error 601. I tested the battery in the bios and failed but did got these two things out of it:Failure ID: RLHKG1-56G87R-XD6XGJ-C0BK03Product ID: NB022EA#ABFIt gave me a link but diddn't show anything when i filled that in.What steps can i take now?

A:Can't boot because of the battery

@JBos? Shutdown the laptop. Remove the MAIN battery. Then try booting with the MAIN battery removed. Let us know if the error goes away. REO

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After my friend's laptop wouldn't run on battery power OR charge the battery I tried many "fixes."
Shockingly none worked that I found.
Only one thing worked for me to my surprise.
A last ditch effort was to open up the laptop (sony pcg-81114L) and disconnect the cmos battery for a few minutes to reset the CMOS.
To my surprise, when powered on, the battery instantly showed it was charging AND when removing the power plug the battery POWERS the laptop now! (and I'd thought I was wasting my time.)
Worked with an off brand battery also.
Many times this has saved many computers that have odd "unsolvable" things wrong with them.
Surely someone else has done this also but I haven't seen it posted anywhere to my knowledge.
Thank GOD for bringing the idea to remembrance!

A:sony vaio won't charge battery or run on battery power (CMOS BATTERY FIX!)

Hi askfault,
Do you have any information on how this fixes the battery problem? would be interested to know.

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I recently got this computer from a friend so I have no idea how long this has been going on. Probably why he got rid of it. I will plug in the power cord and try to boot with the battery in and nothing will happen. If I reach under the laptop and remove the battery and then try to boot up it comes on like normal. I can then put the battery back in but it makes no difference after that. The battery is completely dead. Does anyone know if this is a common problem with a bad battery or what. The computer is a Dell Latitude D630. If I knew that putting a good new battery in it would fix it I would without hesitation I just need to know if that is the problem or is it another glitch. If anyone knows the answer I would appreciate if they would pass it on. Thanks

A:Cannot boot laptop unless battery is out

The charging system has too little capacity to run+charge at the same time. simple solution: buy a new battery

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Hello all,
I'm having an odd problem with a Tecra A6 I picked up recently to refurb in that it will not boot with a battery only: It boots only when the AC/Mains is also connected, however it will finish booting on battery alone (and runs fine) with the AC cord removed soon after pressing the power button. It's just on battery alone that I get no response from pressing the power on button (so the mains has to be attached at that very first stage or I get nothing at all).

Now I'm wondering if maybe its the voltage of the battery? It seems there are 2 options for this model, one at 10.8v and the other at 11.1v. With Windows loaded and Hardware Monitor running it reports the battery is at 0% wear level and charges up fully (so I do not think the battery is faulty), however it states the battery is running at *11.1v,* but the battery installed is in fact the *10.8v* model. Could that be preventing power on with battery only?

Further info on the model I have:
Tecra A6 PTA60E-0EJ013EN
CPU: Intel Core 2 Duo T7200 2.0 Ghz
2 Gb Ram.

Thanks in advance for any help on this one. Main thing I'd like to know is if I do need an 11.1v battery to run this model properly (and get it to power on) on battery alone. If the voltage makes no difference then I guess it must be an odd motherboard issue and I need not bother buying a new battery.

A:Tecra A6 does not boot with Battery only

Update on this one:

It appears the battery is likely faulty: I didn't leave it to run on battery only for long for initial tests so I thought I'd run it down, recharge, then see if that helps. I turned off all the power save settings then left it without the AC attached, however, in spite of reporting a full charge before the AC was removed ,the laptop switched itself off after only 5 minutes or so. On reboot (with AC attached again) the battery is reported as flat!

I have it on charge right now but the battery is *not* getting warm (it did the first time I installed it) so I figure either the battery or the mainboard is reporting the charge level wrong (this is a used battery btw, though it is a genuine Toshiba model, not a dodgy oem import).

Will have to buy another battery and see if the same thing happens (I'll know then if it's the motherboard), but in the meantime if anyone can let me know if the voltage does matter I would appreciate it.

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When on battery, my computer fails to boot. It displays Windows XP logo and loads things but when going into graphics mode it freezes (actually when Windows XP logo disappears it freezes). When on AC Power it boots ok. It looks strange to me. What could be wrong?

P.S.: Safe mode works even when running on battery. If I disconnect AC when XP is already loaded, it doesn't freeze. It works OK at first, but I must test it a little more to be sure. Computer is HP nc8430.

A:Computer does not boot when on battery


If I disconnect AC when XP is already loaded, it doesn't freeze.

On first boot, there is a power drain from the source.
Sounds to me like you need a battery, how old is it?

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Here's a strange one:

On my Thinkpad R31, if it is plugged into an outlet, XP hangs on the splash screen, it even hangs on all safe modes. If I unplug it and let it boot off the battery, it boots perfectly fine. Once it's booted, I can run it off the adapter without a problem. The adapter charges the battery fine, and the battery holds a charge for a little over three hours of light use (web browsing, word processing).

Any ideas as to why it does this? I've tested it several times and it always boots without a flaw off the battery, but never off the adapter. I don't even know what to begin with here its so strange.



BTW, it stops at mup.sys when booting in safe mode.

A:XP will only boot on battery power

Could be the power supply causing it have you tried another power supply?

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We have a group of Elitepad 900 G1s that will not boot on battery.  The BIOS has been updated to the latest available as of 2/17/2017.  They will boot and run normally when the AC adaptor is attached, but as soon as you unplus the adaptor they shut down.  They will not boot at all without the AC adaptor, not even to the HP startup splash screen.  I installed the HP Diagnostic tools on one while it was on the adaptor and ran the battery check utility and it said the batteries were good, but needed calibration.  When I try to calibrate them, I get the message that your device does not support automatic calibration.  I also ran the powercfg.exe /BATTERYREPORT command and it said the batteries were good. How can I get the devices to actually boot when on battery only?

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